[labnetwork] H202 mixture chemical waste

[Bill Flounders]

Aju Jugessur,
Catalase has specifically evolved to breakdown H2O2
with exceptional efficiency. However, it will likely lose
effectiveness at low pH; it's optimum pH is 7.
Since your solution is HF, I estimate solution pH 3-4.

I'd estimate an approximate dose of NaOH to bring pH
anywhere between 5 and 8. Then add bovine catalase so
concentration is ~0.5 - 1 mg/l.

Wiki has an interesting entry on catalase.
I just learned why our hair turns gray.

-------
Can you share with the community the reason
for tartaric acid in solution 3 or any related reference ?

Sincerely,
Bill Flounders
UC Berkeley


Jugessur, Aju S wrote:
>
> Hi,
>
> I need some advice on waste disposal and management of the following 
> chemical mixtures:
>
> 1.  1 mM AgNO3 and 0.5 vol% HF
>
> 2.12.5 vol% HF, 3 vol% H2O2 and 84.5% deionized (DI) water
>
> 3.5ml HF,  30ml H2O2 , 48ml H2O/4.8g C4H6O6 (10%)
>
>
> When we place the above mixtures (2,3) in waste bottles, they still 
> generate some gases. E&HS refuses to pick up these wastes until the 
> reaction is complete.
>
> It can take a while for the reaction to stop releasing any gases and 
> as a result the waste bottles sit in our lab for a while until they 
> are picked up. It is also not practical
>
> and safe to keep opening the bottles to release the gas. We are also 
> running out of space to keep the waste bottles.
>
>
> I was wondering if there is a better way of managing these specific 
> chemical waste and also, whether there is a safe and cost-effective 
> way to stop the reactions (2,3) before we have them picked up by E&HS. 
> A quick search suggests Oxalic acid to quench
>
> the H202 but we have a mixture of H202 with other chemicals.
>
>
> Thanks
>
> Regards
>
> Aju
>
>
> Aju Jugessur /Ph.D./
> Director, University of Iowa Microfabrication Facility
> Professor (Adj.), Physics and Astronomy
> OSTC, Iowa Advanced Technology Labs
> University of Iowa
>
> 205 N. Madison St
> Iowa City, IA 52242
> 319 -353-2342
> aju-jugessur at uiowa.edu
> http://ostc.uiowa.edu/uimf
>
>
>
>
>
>
>
>
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